<nz-spin [nzTip]="'Loading...'" [nzSpinning]="isLoading">
  <nz-select #select style="width: 100%" nzMode="multiple" nzPlaceHolder="请选择书籍" [(ngModel)]="listOfSelectedValue"
    (ngModelChange)="modelchange()">
    <nz-option *ngFor="let option of listOfOption" [nzLabel]="option.name" [nzValue]="option.id"></nz-option>
  </nz-select>
</nz-spin>
